STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Sep. 30, 2012

Summary of ESPP Transactions

The following table summarizes our ESPP transactions during the fiscal periods presented (in thousands, except per share amounts):

	As of September 30, 2012		Six Months Ended September 30, 2012
	Shares of Common Stock		Shares of Common Stock		Weighted Average Price per Share
Reserved for future issuance		1,405
Issued				13	$	7.61

Stock Option Transactions

Our stock option transactions during the six months ended September 30, 2012 are summarized as follows:

	Outstanding			Weighted Average Exercise Price per Share		Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (in thousands)		In-the-money Options Vested and Exercisable (in thousands)
Balance at April 1, 2012		6,345,307		$	7.23		4.67	$	9,474		1,193
Granted		1,259,700			7.91
Exercised		(455,946	)		6.72
Cancelled		(249,551	)		10.65
Forfeited		(703,062	)		6.30
Balance at September 30, 2012		6,196,448		$	7.38		4.70	$	5,950		1,081
Vested and expected to vest, September 30, 2012		5,487,339		$	7.42		4.49	$	5,251
Vested and exercisable, September 30, 2012		2,268,140		$	8.18		2.38	$	1,514

Options Exercised

Intrinsic value of options exercised for the periods indicated below were as follows (in thousands):

	Three Months Ended				Six Months Ended
	September 30, 2012		October 2, 2011		September 30, 2012		October 2, 2011
Intrinsic value of options exercised	$	177	$	2	$	575	$	7

RSU Transactions

Our RSU transactions during the six months ended September 30, 2012 are summarized as follows:

	Shares			Weighted Average Grant- Date Fair Value		Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (in thousands)		Unrecognized Stock-based Compensation Cost (in thousands)
Unvested at April 1, 2012		604,655		$	7.13		2.38	$	5,079	$	3,537
Granted		186,254			8.17
Issued and released		(92,805	)		6.86
Forfeited		(79,250	)		6.96
Unvested at September 30, 2012		618,854		$	7.50		1.96	$	4,951	$	3,284
Vested and expected to vest, September 30, 2012,		492,583					1.86	$	3,941

Stock-Based Compensation Expense

The following table summarizes stock-based compensation expense related to stock options and RSUs during the fiscal periods presented (in thousands):

	Three Months Ended				Six Months Ended
	September 30, 2012		October 2, 2011		September 30, 2012		October 2, 2011
Cost of sales	$	129	$	69	$	114	$	128
Research and development		236		488		109		790
Selling, general and administrative		982		620		1,298		1,143
Total Stock-based compensation expense	$	1,347	$	1,177	$	1,521	$	2,061

Unrecognized Stock-Based Compensation Expense

The following table summarizes unrecognized stock-based compensation expense related to stock options and RSUs for the periods indicated below as follows:

	September 30, 2012				April 1, 2012
	Amount (in thousands)		Weighted Average Expected Remaining Period (in years)		Amount (in thousands)		Weighted Average Expected Remaining Period (in years)
Options	$	6,693		2.9	$	8,119		2.8
RSUs		3,284		2.8		3,537		3.2
Total Stock-based compensation expense	$	9,977			$	11,656

Weighted Average Assumptions to Calculate Fair Values of Options Granted

We used the following weighted average assumptions to calculate the fair values of options granted during the fiscal periods presented:

	Three Months Ended						Six Months Ended
	September 30, 2012			October 2, 2011			September 30, 2012	October 2, 2011
Expected term of options (years)		4.5			4.3		4.2 – 4.5	4.3
Risk-free interest rate		0.5	%		0.9	%	0.5% – 0.6%	0.9% – 1.5%
Expected volatility		41	%		42	%	41% – 42%	41% – 42%
Expected dividend yield		—			—		—	—
Weighted average estimated fair value	$	2.68		$	2.01		$        2.72	$        2.12